For speakers with rotatable horns, how might one go about rotating the horn in EASE while maintaining the case's orientation?

It seems like I used to be able to do this by saving the speaker .skp file with a "_rot" suffix and then open the _rot.frd file that is automatically created, turn off room symmetry (if necessary), make an object of the whole case, rotate it 90 degrees, save it, and it would still be associated with the _rot.spk file. Not sure why this doesn't work any more.

This process would be less tedious if you could create an object or rotate the room about the y-axis in the edit case module.

I do realize that this approach will not represent the same speaker coverage as a speaker that was measured with a rotated horn, but it would work well enough for my purposes. It seems like more manufacturers are providing data for both orientations, which is very nice, but till more on board I'd like an alternative to "fake it."